Assessment and Preparation of Soil Salinity Maps for Some Agricultural Lands in Al-Sharqat City/Salahdin Using GIS."
DOI:
https://doi.org/10.56286/737m9628Keywords:
arid lands, soil salinity, GIS (GIS), Soil (Aridisol) Soil (Entisol)Abstract
The study aims to assess soil salinity under the effect of groundwater and prepare spatial distribution maps of water characteristics, and water quality indices using a geographic information system. A total of 40 soil samples were collected from the surface layer at two different locations. The first location included 20 samples from the sedimentary soil unit, while the second location included 20 samples from the calcareous soil unit at wells sites. The samples were analyzed to determine the concentration of dissolved ions in the soil, such as calcium, magnesium, sodium, and potassium, as well as anions such as bicarbonate, chloride, and sulfate. Many soil salinity indices were calculated such as SAR (Sodium Adsorption Ratio), Na% (Sodium Percentage), PS (Potential Salinity), RSC (Residual Sodium Carbonate), TDS (Total Dissolved Solids), and ESP (Exchangeable Sodium Percentage). Spatial distribution maps were prepared using Inverse Weighting Distance (IWD) in ArcGIS software. The results showed that the concentrations of calcium and chloride were high at both locations, while the sodium levels were moderate. Additionally, the value of EC and TDS are high. The water quality in the study area has an effect over time on soil degradation.
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